Virtual Dj Mega

[Brigitta Martini]

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Hello,

I'm EXTREMELY new to Arduino and have no previous knowledge in coding whatsoever. I apologize in advance for being long-winded but, have alot to explain.

I have an organ console which controls a virtual organ program called jOrgan. I've decided to change out the keyboards as, I was never happy with ( touch) as they were from two generic Yamaha keyboards, and the contacts were becoming unreliable.

I acquired two actual organ manuals with a contacts and buss arrangement that I want to use. I did some research and the cost to midify the manuals , to be out of my budget and looked for alternatives.

I found a site that a fellow created that, deals with this very situation and have been in contact with him. He is very busy and only replies once or twice a week so, I've came here for hopefully some more help and advice!

I ordered two Mega 2560 boards and two USB A to B cables, and have wired up one of the boards. One wire from each key contact, was attached to each pin. Pins that are NOT to be connected to are pins zero and 1 (the rx0 and rxt pins)? The 3.3 and 5 volts pins. After watching a YouTube tutorial, I was able to run the blink sketch which worked as it should buy from there, having difficulties.

He suggests wiring randomly to the pins and then, using the program midi-ox to monitor what actual pins are connected to which key so, it can be corrected in the actual sketch. I am also using the programs hairless midi-serial bridge and loop midi.

As of now, I am not seeing anything from midi-ox from the organ keyboard. Arduino shows M2560 (COM3) as the Port and it also shows up in the hairless midi-serial bridge.

Totally confused

The only way we can help is if we can see what program you have loaded into the Mega and exactly what you have connected to it. For example how is the Arduino connected to the computer and specifically what type of MIDI output are you using.

Everyone is new in the beginning, no shame in that. But....

Try to learn coding somehow, somewhere, and play with microcontrollers like the Arduino family using simple, basic hardware.

The project You have in mind is quite advanced and You might be banged up until You've got some basic knowledge in coding and circuitry.

Thankyou all for the replies. Currently the only thing I have sent to Mega, is the blink sketch. The Mega is connected to my laptop through a USB a to b cable.

The website is " virtual pipe organs.wordpress.com in it, there are links to his page about converting the keyboards and other controllers to midi using the Mega.

He does provide a sketch which is quite lengthy, for both the keyboards and expression pedals and also one for the pedals and stops. I am only in need of the one for the keyboards. I printed out the particular sketch so I could kind of follow along. He mentions using midi-ox to monitor key presses and the pins that they are connected to. Unfortunately I am not sure if I need to send some program to the Mega to start this activity?

And you have no idea how it works of course. Well i can speak for myself and tell you that i am willing to help, but not with some 3rd party software that needs to be modified or understood and explained.

There is one library, that would eb very suitable for your purpose being Control-surface which is being maintained by someone that is active here on the forum.

It is not difficult to make an Arduino to send midi-commands, but to make it appear as a usb-midi device, only the 32u4 boards are supported (micro & leonardo) although it can be done on any board that has a 16u2 as a usb adapter like the Mega. I say it can be done, but i am not helping. Of course you thought you needed a board with many pins and got the Mega, but with multiplexers you can easily supply the pins required.

Anyway, you can create a true-midi device without issue using any of the UARTs on the Mega, but if you want to stick the the software plan that you have, it is possible that you will be stuck with it's author.

If you want to make the keyboard touch-sensitive, you have another issue. I guess for a real pipe organ it may not matter much, but i always want my midi-keybaord to send touch sensitive velocity levels.

They are actually measured in my keyboard with by the difference in between the pressing of two switches within the same key. Velocity means speed, it all makes sense to me. (I have seen touch-sensitive midi switches for sale somewhere btw.)

Deva_Rishi,

Thankyou for your reply and the information as well. It sounds very interesting and am looking for the path of least resistance certainly. In my simple mind, I have 61 keys per keyboard and 61 separate wires from the contacts, that need to go somewhere and as of now, they are plugged in to the Mega.

The author of control surface, mentions the use of hairless midi-serial bridge so I am familiar with that program to some extent. I am willing to learn what I can if not too difficult.

I can say that I AM somewhat intimidated. For me it's like asking someone to learn to read music so they turn on the stereo.

Thankyou all for any assistance!

Well it's all about fairly simple things, if you check out the examples it should all become a bit more clear, I do agree with @Railroader, that what you are trying to do is not quite beginner level, but a bit more intermediate.

Study the basic examples, mainly 'control' and let google be your friend.

The site is secure.

The ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Objective: Several, but not all, previous studies of brain structure in anorexia nervosa (AN) have reported reductions in gray matter volume and cortical thickness (CT) in acutely underweight patients, which seem to reverse upon weight gain. The biological mechanisms underlying these dynamic alterations remain unclear.

Method: In this structural magnetic resonance imaging study, we first replicated and extended previous results in (1) a larger independent sample of 75 acutely underweight adolescent and young adult female patients with AN (acAN; n = 54 rescanned longitudinally after partial weight restoration), 34 weight-recovered individuals with a history of AN (recAN), and 139 healthy controls (HC); and 2) a greater combined sample compiled of both our previous samples and the present replication sample (120 acAN [90 rescanned longitudinally], 68 recAN, and 207 HC). Next, we applied a "virtual histology" approach to the combined data, investigating relations between interregional profiles of differences in CT and profiles of cell-specific gene expression. Finally, we used the ENIGMA toolbox to relate aforementioned CT profiles to normative structural and functional connectomics.

Results: We confirmed sizeable and widespread reductions of CT as well as volumes (and, to a lesser extent, surface area) in acAN and rapid increases related to partial weight restoration. No differences were detected between either short- or long-term weight-recovered patients and HC. The virtual histology analysis identified associations between gene expression profiles of S1 pyramidal cells and oligodendrocytes and brain regions with more marked differences in CT, whereas the remaining regions were those with a greater expression of genes specific to CA1 pyramidal, astrocytes, microglia, and ependymal cells. Furthermore, the most affected regions were also more functionally and structurally connected.

Conclusion: The overall data pattern deviates from findings in other psychiatric disorders. Both virtual histology and connectomics analyses indicated that brain regions most affected in AN are also the most energetically demanding.

The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila.

You can find in the Getting Started with Arduino MEGA2560 Rev 3 section all the information you need to configure your board, use the Arduino Software (IDE), and start tinkering with coding and electronics.

Check the Arduino Forum for questions about the Arduino Language, or how to make your own Projects with Arduino. Need any help with your board please get in touch with the official Arduino User Support as explained in our Contact Us page.

The ATmega2560 on the Mega 2560 comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK500 protocol (reference, C header files).

The Mega 2560 has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

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